<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <p>{{msg}}</p>
        <button @click="fn">反转世界</button>
    </div>
</body>
<script src="../vue.js"></script>
<script>
    const app = new Vue({
        el: "#app",
        data: {
            msg: 'hello,world'
        },
        methods: {
            fn() {
                console.log(this.msg.split('').reverse().join(''))
                this.msg = this.msg.split('').reverse().join('')
            }
        }
    })
</script>

</html>